Video: Hand swapping viral optical illusion stumps internet

New Delhi : A hand-swapping optical illusion is stumping internet all across the world as the viral act is fetching reactions with people trying their hands on it.

In a video posted on Twitter, a girl is seen intertwining her hands before suddenly breaking them apart; in the process, she appears to switch hands. User kay_dera interlocks the fingers of her back hand around her front hand. In a flash, she appears to break her back hand free and makes a fist with her front hand.

Watch video below:

In surprise reaction, people are posting their videos too:

There are users who are also posting tutorials to explain how it is done.

Overwhelmed with the reaction, the girl who started the challenge said, "I love watching people attempt this challenge." She continued: "Who would have thought someone like myself would have people all over the world do something that I just posted out of fun?"